Apparatus for producing the inward run of the carriage in self-acting mules.



P. BOURGART. APPARATUS FOR PRODUCING THE INWARD'RUN OF THE GARRIAGE IN SELF ACTING MULES.

APPLICATION FILED APR. 10. 1914.

1,1 20,895, Patented Dec. 15, 1914.

.2 SHEETS-SHEET 1.

THE NORRIS PETERS 420., PHOTO4J7HO.. WASHINGTON. D. C.

P. BOUROART. APPARATUS FOR PRODUCING THE INWARD RUN OFVTHE CARRIAGE IN SELF ACTING MULES. APPLICATION FILED APR. 10, 1914.

1,120,895, Patented Dec. 15,1914.

2 SHEETS-SHEET 2.

HE NDRRIS PETERS C0,. PHOTO LV THO.. WASHINGTON. D. r

P EDETATES 3- rPAUtBoU rtoAnT, onrnnis, r rtnncn. a

APPARATUS FOR PRODUCING THE INWARD B M-s rnncnnnmen in sntrac'rrne MU n's. f

To all whom it may concern:

Be it known that 1, PAUL. BoURoARna citizen of theRepublic of Switzerland, iresiding at 54 Avenue de Saxe, Paris, France, have invented certain newand useful Improvements in Apparatus for Producing the Inward Run of the Carriage in Self-Acting Mules, of which the following is'a specification.

The movement of the carriagein'its inward run in self-acting mules is a varied movement, that is, the carriage starts from rest, then has a progressively accelerated speed, and then from the middle point of its run the speed of the carriagediminishes gradually until it becomes m'l at the end of its run. This movement has been produced hitherto by means of a shaft on which are fixed spiral grooved pulleys, known as scrolls which wind on and unwind cables I whose other ends are attached to the car riage. The scroll shaft has 'a constant motion during the whole of the time during which it is in gear, and it is by winding the cables on varying diameters that the carriage receives the varying motion which it is required to have. lVith that arrangement the winding on of the cables takes place therefore during a part of said motion on very small diameters which are sometimes less than four times the diameter of the cable. 'In these circumstances the cables wear away very soon and entail a high cost of upkeep and loss through stoppages of the machine.

My invention has for its object to provide an apparatus in which those drawbacks are eliminated. To this end the variations of the linear speed of the carriage instead of being produced by winding-on members of varying diameter fixed on the back shaft that is a shaft having a uniform speed, are produced according to this invention by winding-on members of a suitable constant diameter fixed on a shaft whose speed is caused to vary as desired by means of suitable IHBCllaIllSIIl. The diameter of the windmg-on member can therefore be made large enough to avoid all wear of the cables. The

shaft on which the winding-011 member of constant diameter is fixed, may of course, be driven at varying speeds according to requirements by any suitable mechanism. In particular, there may be employed for this purposethe very simple mechanism hereinspecifi m fm eem nt; ratenteainee:15,1914; Application filed 'ltpril10,1914. Serial No. 830,864.

after described which can be readily edtoexisting mules.

Figure ,1, is a side elevation of my Iimwere proved apparatus, viewed from' -thenback w ofthe headstock, showingaalsothe essential parts ofthe old constructions which may be retained. Fig. 2 is a plan to Fig. 1.1 Fig. 3"1s a verticalcrosssection of the speed varying mechanism. F ig. 4-is a horizontal.

section ofthis mechanism. 7 i

. The driving power is transmitted by means of a clutch 1 of the friction or other type mounted on a vertical shaft2 located at the back of theheadstock. These parts are found 111 existing machines. 1 Atthe lower end ofutheclutchthere is located a bevel pinion 3, that .drivesla bevelgear 1. These gears, as well as the scroll shaft 5, are also found in'existing machines. C i

6 are the scrolls which according to my invention, have a constant diameter large draws the carriage and which is wound on said scrolls. However, whereas in existing machines the bevel wheel 1 is fixed on the shaft 5, according to my invention the Wheel L is loose on the shaft 5 and is connected to a pinion 7 This pinion 7 drives a gear 8 fixed on a shaft 9 mountedin bushings 10, 10 provided in the casing 11 of the apparatus. The shaft 9 also carries a radial slotted arm 12 in which works a slide block 13. In the center of this slide block there engages the crank-pin 14; of the crank 15 of a shaft 16 mounted in a bushingl'? in the casing 11. The other end of the shaft enough to avoid all wear of the cable which i spiral .grooves of thesesscrolls have a-con-.

stant diameter. The shaftlfiis offset r l tive to the shaft 9.

At each inward run of the carriage the shafts 9 and 16 make exactly one'revol'ution,

the ratio of the gears 18 and 19 having been selected accordingly. But whereas the crankv 15 has, a fixed length, the leverage of the driving force varies owing to the displace 1051 ment of the arm block 18 in the slide 12. Consequently the rotational speed of the shaft '16 will vary according to the law of if variation of the said leverage. The constant diameter of the scrolls 6, 6 and of the check scroll is equal to the maximum diameter of .110 v p I.

the scrolls hitherto used, and the development of their helix is equal to the linear travel of the carriage. The number of revolutions of the shaft 5 being known, it is -right of the headstock. It:may comprise the bearing 21 that supports the shaft 5 and at the same time serves as an abutment for the bevel wheel 4.

The bearings 22 for the shaft 5 are fixed to the ends of the headstock.

The hereinbefore described mechanism has the advantage that it requires only the very slightest alteration in the construction of self-acting mules. My invention however is not restricted to this particular mechanism. I

hat I claim is:

1. In apparatus for producing the inward run of the carriage in a self-acting mule, the combination of a scroll shaft, scrolls of a constant diameter fixed on said shaft, and

Copies of this patentrmay be obtained for five cents each, by addressing means for continuously and progressively varying the speed of said scroll shaft for producing the required gradually accelerated and slackened speed of travel of the carriage.

v 2. In apparatus for producing the inward run of the carriage in a self-acting mule, the combination of a scroll shaft, scrolls of a constant diameter fixed on said shaft, a crank shaft and a slotted arm shaft both parallel to said scroll shaft, and offset rela:

tive to each other, the crank on the said crank shaftengaging by means of its crank pin with a slide block working in the slotted arm of the other shaft, ahollow shaft loosely mounted on said scroll shaft, gear Wheels on saidhollow shaft one gear wheel driving said slotted arm shaft, the latter transmitting its rotation through said crank shaft to said scroll shaft at a continuously and progressively varying speed.

In testimony whereof I have affixed my signature-in presence of two witnesses.

e PAUL BOURCART. WVitnesses LoUIs FAUTRAT, CHAS. P. PEMBY.

the Commissioner of Patents,

Washington, D. C. 

